Rename model package to actor
Add missed class from previous commit
Update reference to Actor in Action.java
Update README.md
Add and Update documentation in Entity.java and Location.java
Add Concept of Configuration

It will be similar to JSON syntax, but each entry (if it does not belong
to an array or collection) will be terminated with a semicolon.

It will also support referencing other properties in the same file,
using the ${<property>} syntax, such that <property> is the name of the
property being selected.
Add more specific exception text to Action.java
Add Follower and Actor-Actor interaction base
Add Party argument to NpcTrainer constructor
Fix spelling in Entity